ENGINEERING SYSTEM CO., LTD.
14Patents
4Active
14Granted
38Portfolio score
Filing activity: Feb 20, 1976 → Nov 27, 2018
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6293492A | Coaxial twin-rotor type helicopter | Performing Operations; Transporting | 32 | Expired |
| US4022038A | Magnetically operated locking device and key | Emerging Cross-Sectional Technologies | 28 | Expired |
| US4023157A | Theft alarm for portable articles | Physics | 20 | Expired |
| US4117462A | Ultrasonic transmitter for burglar alarm system | Physics | 17 | Expired |
| US4365750A | Adjustable sprinkler system | Human Necessities | 10 | Expired |
| USD258918S | Plant light | General | 10 | Expired |
| US4106442A | Device for increasing fuel economy of an internal combustion engine | Emerging Cross-Sectional Technologies | 6 | Expired |
| US4097809A | Local event broadcast system | Electricity | 5 | Expired |
| US4280025A | Lockable cover assembly for push-button key pad | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4164911A | Apparatus for re-inking printing ribbons | Performing Operations; Transporting | 2 | Expired |
| US9182627B2 | Liquid-discharging device with observation optical system | Physics | 0 | Active |
| US10682664B2 | Microvolume-liquid application method and microvolume-liquid dispenser | Performing Operations; Transporting | 0 | Active |
| US10221060B2 | Microvolume-liquid dispensing method and microvolume-liquid dispenser | Performing Operations; Transporting | 0 | Active |
| US10912486B2 | Medical posture retainer | Human Necessities | 0 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.